Latest Viking program Stories

Weather, which changes day-to-day due to constant fluctuations in the atmosphere, and climate, which varies over decades, are familiar. More recently, a third regime, called “macroweather,” has been used to describe the relatively stable regime between weather and climate.

Mars Express has adjusted its sites, and is targeting the spot for Curiosity's landing this Sunday night. The spacecraft will also assist in monitoring the delivery of Curiosity to the Red Planet in its "seven minutes of terror" descent.

A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.